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cgroupv2, docs: fix misinformation in "device controller" section 

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1. Clarify cgroup BPF program type and attach type;
2. Fix file path broken.

Signed-off-by: ArthurChiao <arthurchiao@hotmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
ArthurChiao 2021-09-08 16:08:15 +08:00 committed by Tejun Heo
parent b94f9ac79a
commit c0002d11d7
1 changed files with 11 additions and 11 deletions
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22
Documentation/admin-guide/cgroup-v2.rst
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@ -2170,19 +2170,19 @@ existing device files.
Cgroup v2 device controller has no interface files and is implemented
on top of cgroup BPF. To control access to device files, a user may
create bpf programs of the BPF_CGROUP_DEVICE type and attach them
to cgroups. On an attempt to access a device file, corresponding
BPF programs will be executed, and depending on the return value
the attempt will succeed or fail with -EPERM.
create bpf programs of type BPF_PROG_TYPE_CGROUP_DEVICE and attach
them to cgroups with BPF_CGROUP_DEVICE flag. On an attempt to access a
device file, corresponding BPF programs will be executed, and depending
on the return value the attempt will succeed or fail with -EPERM.
A BPF_CGROUP_DEVICE program takes a pointer to the bpf_cgroup_dev_ctx
structure, which describes the device access attempt: access type
(mknod/read/write) and device (type, major and minor numbers).
If the program returns 0, the attempt fails with -EPERM, otherwise
it succeeds.
A BPF_PROG_TYPE_CGROUP_DEVICE program takes a pointer to the
bpf_cgroup_dev_ctx structure, which describes the device access attempt:
access type (mknod/read/write) and device (type, major and minor numbers).
If the program returns 0, the attempt fails with -EPERM, otherwise it
succeeds.
An example of BPF_CGROUP_DEVICE program may be found in the kernel
source tree in the tools/testing/selftests/bpf/progs/dev_cgroup.c file.
An example of BPF_PROG_TYPE_CGROUP_DEVICE program may be found in
tools/testing/selftests/bpf/progs/dev_cgroup.c in the kernel source tree.
RDMA